Given your premise that American media is reporting Chinese Economic Slowdowns more widely than other country's media, there are two options:

1. Conspiracy - They are working together, and perhaps with the government and other private entities, to sow a particular narrative 2. Profit - Their audiences are particularly interested in these stories, given the e.g. aforementioned trade war

I'll leave it to the reader to decide which of these it might _actually_ be.